﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.AddIn.Pipeline ;

namespace CalcHostView
{
    public  interface ICalculator
    {
        double Add(double x, double y);

        double Substract(double x, double y);

        double Mitiply(double x, double y);

        double Divide(double x, double y);
    }
}
